1、 Daily maintenance precautions

1. Appearance cleaning
   • Shell cleaningAfter daily testing, wipe the outer shell with a clean soft cloth to remove dust and stains. Stubborn stains can be wiped with a small amount of mild cleaner, but it is necessary to avoid the cleaner from seeping into the interior.
   • Display screen protectionUse a dedicated screen cleaning cloth to wipe the display screen to prevent scratches from affecting data reading.
2. Pressure head cleaning
   • After each test, clean the surface and edges of the indenter with a soft brush to remove debris or contaminants.
   • For difficult to clean stains, an alcohol cotton ball can be used to wipe them. If there is wear or scratches on the surface of the indenter, it is necessary to check the impact on the testing accuracy and replace it if necessary.
3. Maintenance of testing platform
   • cleanlinessBefore each test, check and wipe the surface of the platform to ensure that there are no debris.
   • flatnessRegularly use a level to check the levelness of the platform, and if there is any tilt, adjust the anchor bolts in a timely manner for calibration.
   • Wear and tear repairIf there is slight wear on the surface of the platform, it can be repaired by polishing with fine sandpaper; If the wear is severe, it needs to be replaced to ensure that the sample level is stable during testing.
4. Maintenance of transmission system
   • lubricationAdd specialized lubricants to transmission components such as lead screws and guide rails every two months to ensure even application and avoid excessive splashing.
   • Tightening inspectionCheck the tightness of the screw nut to prevent the test accuracy from being affected by loose nuts.
   • protectionInstall protective casing to prevent dust and moisture from entering, especially in harsh environments where inspection needs to be strengthened.
5. Sensor protection
   • pressure sensorTo avoid severe impact or overload, strictly operate according to the prescribed upper pressure limit. Keep the surrounding environment of the sensor clean and regularly check whether the connecting wires are loose or damaged.
   • displacement sensorEvery month, use high-precision displacement measurement standard instruments to check the accuracy and compare the sensor display value with the actual displacement value of the standard instrument. If the error exceeds the specified range, the sensor needs to be debugged or calibrated. Special lubricant shall be regularly added to its transmission parts to reduce friction resistance, and protective devices shall be installed to prevent foam chips from splashing to damage the sensor.
6. Software system maintenance
   • update patchRegularly check whether the software system has available update patches, download and install them in a timely manner to fix vulnerabilities and optimize hardware compatibility.
   • Function upgradePay attention to the feature upgrade information released by software developers, upgrade in a timely manner according to actual needs, and enhance testing data analysis capabilities.
   • data managementExport test data to external storage devices every week, pay attention to the integrity and accuracy of the data, and classify and manage it. Regularly clean up useless or duplicate data, and summarize the change rule of indentation hardness of foam materials through data mining.

2、 Calibration precautions

1. Pressure sensor calibration
   • calibration cycleIt is recommended to calibrate using high-precision standard weights once every quarter.
   • calibration methodPlace the standard weight on the pressure head and compare the sensor display value with the actual weight of the weight. If the deviation exceeds the allowable range, adjust it through the instrument's built-in calibration program.
   • multi-point calibrationAccording to the characteristics of the sensor, generally a 3-point calibration (such as 3-5%, 30-50%, and 70-90% of the range) can achieve good accuracy. If calibrating more than 3 points, it is necessary to ensure that the "AD value" and "standard weight value" of the latter point are both greater than those of the previous point.
2. Displacement sensor calibration
   • calibration cycleUse high-precision displacement measurement standard instruments to check accuracy every month.
   • calibration methodCompare the displayed value of the sensor with the actual displacement value of the standard instrument. If the error exceeds the specified range, the sensor needs to be debugged or calibrated.
3. Calibration of other parameters
   • time controlRegularly check the time control parameters of the testing machine to ensure accurate time measurement during the testing process.
   • Comprehensive calibrationAccording to the requirements of the equipment manual, comprehensively verify the parameters of the pressure sensor, displacement sensor, and time control of the testing machine to ensure that the overall measurement accuracy meets the standards.

3、 Operating standards and safety precautions

1. Pre operation inspection
   • Ensure that the equipment is in good working condition, check whether the power connection is stable, and whether all components are intact and undamaged, especially key components such as pressure heads, sensors, and control systems.
   • After turning on the device, give a certain preheating time to ensure that the internal components of the machine reach a stable working state and reduce measurement errors caused by temperature changes.
2. Sample processing
   • Select representative sponge samples based on testing requirements, which should have no obvious defects, meet the size requirements of the testing machine, and maintain a regular shape as much as possible.
   • Perform necessary pre-treatment on the sample, such as removing surface impurities, trimming to the specified size, etc. Place the processed sample on the testing platform of the testing machine to ensure good contact between the sample and the platform, without any hanging or tilting phenomenon.
3. Emergency handling
   • In case of emergency during the testing process (such as equipment loss of control, sample rupture, etc.), the emergency stop button should be immediately pressed to cut off the power and corresponding measures should be taken for handling.
4. Environmental Requirements
   • Avoid using equipment in environments with vibration, shaking, direct sunlight, high temperatures, dust, and humidity.
   • The AC power supplied to the equipment should be well grounded to ensure safe use. Water and debris must not be injected into the equipment to prevent damage to electronic components and electric shock.